How to change redirection page deafult.aspx page to another page in collaboration portal in sha

I have created one collaboration portal. Now I want to change the page navigation default.aspx page to another page.I am having two pages in pages directory. one is default.aspx and another is test.aspx page. Now I want to navigate page test.aspx default. Please advice the best solution.

Go4Sharepoint, is a Microsoft Featured Community.
Microsoft, Windows, Sharepoint, Sharepoint logo, Windows logo, etc are trademarks of the Microsoft Corporation.
All product names, logos, copyrights, and trademarks mentioned are acknowledged as the registered intellectual property of their respective owners. This site is not in any way affiliated with, nor has it been authorized, sponsored, or otherwise approved by, Microsoft Corporation.